UpdateOne Method

The updateOne() method is used to update a single document that matches the specified filter criteria in a collection. If multiple documents match the filter, only the first document encountered is updated.

Syntax:

db.collection.updateOne(
   <filter>,
   <update>,
   {
     arrayFilters: [ { <filterCondition> } ],
     multi: true
   }
)

Explanation:

• <filter>: This is the criteria to select the documents to update.
• <update>: This is the update operation to perform, including the modifications to the array elements.
• arrayFilters: This option specifies the conditions to identify the array elements to update.
• multi: true: This option ensures that all matching array elements are updated (optional).

Example: Here, We Are Updating The Value Of The HTML Course Duration From 4 Weeks To 5 Weeks Using The updateOne Method.

Suppose we have a gfg database in courses collection which stores information about various courses. Each document in the collection represents a course and contains details such as the course name, Instructor name, fees, and duration.

After inserting a record into the courses collection, Our courses look like:

Query:

Let’s Update the “duration” field of the “HTML” course in a MongoDB collection to “5 weeks” using the positional operator.

db.collection.update(
   { "_id": 1, "courses.name": "HTML" },
   { "$set": { "courses.$.duration": "5 weeks" } }
)

Output:

Explanation: This query updates the “duration” field of the nested object within the “courses” array where the “name” field is “HTML” and the “_id” of the document is 1. The positional operator $ is used to update the matching element in the “courses” array.

Imagine we are managing a database with a large collection of documents, each containing arrays of nested objects. Now, here the challenge comes by updating specific objects within those arrays without altering the rest of the document. This is a common scenario in MongoDB, a powerful NoSQL database.

In this article, we’ll learn about updating objects within a document’s array, exploring multiple approaches to efficiently handle nested updating in MongoDB. Whether you’re a MongoDB novice or an experienced user, mastering these techniques will enhance your database management skills and streamline our data manipulation processes.